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In one bar graph showing average gratuities paid by 28 professions, “teachers” placed dead last, behind day laborers and “religious professionals” a category that includes those free-spending sub-groups, nuns and priests. The teachers cried, “Foul!” and the powerful California Teachers Union issued a written protest denying the article’s finding and containing statements by several of its members, all of whom swore that they tipped 20%. Restaurant News stuck to its guns. The numbers didn’t lie, they said; teachers across the country were tipping just under 11%.